Extract the original Mermaid diagram source embedded in an SVG file created by
AI agents call extract_mermaid_from_svg to retrieve information from Obsidian Markdown Lint without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation by querying/extracting information from an existing SVG file. It does not create, modify, delete, or execute code. The only effect is retrieving embedded metadata (the Mermaid source code), which classifies it as a Read operation. The blast radius is minimal since the tool cannot affect external systems or cause unintended changes to the user's vault.
From the tool's definition The tool 'extract_mermaid_from_svg' retrieves or extracts the original Mermaid diagram source embedded in an SVG file. The verb 'extract' indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Extract the original Mermaid diagram source embedded in an SVG file created by. It is categorised as a Read tool in the Obsidian Markdown Lint MCP Server, which means it retrieves data without modifying state.
Register the Obsidian Markdown Lint MCP server in PolicyLayer and add a rule for extract_mermaid_from_svg: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Obsidian Markdown Lint. Nothing to install.
extract_mermaid_from_svg is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the extract_mermaid_from_svg rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for extract_mermaid_from_svg. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
extract_mermaid_from_svg is provided by the Obsidian Markdown Lint MCP server (psenger/obsidian-markdown-lint-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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